private static bool TryParseGuid(ReadOnlySpan <char> guidString, ref Guid.GuidResult result)
{
guidString = guidString.Trim();
if (guidString.Length == 0)
{
result.SetFailure(false, "Format_GuidUnrecognized");
return(false);
}
switch (guidString[0])
{
case '(':
return(Guid.TryParseExactP(guidString, ref result));
case '{':
return(!guidString.Contains <char>('-') ? Guid.TryParseExactX(guidString, ref result) : Guid.TryParseExactB(guidString, ref result));
default:
return(!guidString.Contains <char>('-') ? Guid.TryParseExactN(guidString, ref result) : Guid.TryParseExactD(guidString, ref result));
}
}
/// <summary>
/// Delimits all leading occurrences of a set of elements specified
/// in a readonly span from the span.
/// </summary>
/// <param name="span">The source span from which the elements are removed.</param>
/// <param name="trimElements">The span which contains the set of elements to remove.</param>
private static int ClampStart <T>(ReadOnlySpan <T> span, ReadOnlySpan <T> trimElements) where T : IEquatable <T>
{
int start = 0;
for (; start < span.Length; start++)
{
if (!trimElements.Contains(span[start]))
{
break;
}
}
return(start);
}
/// <summary>
/// Delimits all trailing occurrences of a set of elements specified
/// in a readonly span from the span.
/// </summary>
/// <param name="span">The source span from which the elements are removed.</param>
/// <param name="start">The start index from which to being searching.</param>
/// <param name="trimElements">The span which contains the set of elements to remove.</param>
private static int ClampEnd <T>(ReadOnlySpan <T> span, int start, ReadOnlySpan <T> trimElements) where T : IEquatable <T>
{
// Initially, start==len==0. If ClampStart trims all, start==len
Debug.Assert((uint)start <= span.Length);
int end = span.Length - 1;
for (; end >= start; end--)
{
if (!trimElements.Contains(span[end]))
{
break;
}
}
return(end - start + 1);
}
